Apache Log4cxx  Version 1.3.0
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widelife.h
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1/*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef _LOG4CXX_HELPERS_WIDELIFE_H
19#define _LOG4CXX_HELPERS_WIDELIFE_H
20
21#include <log4cxx/log4cxx.h>
22#if defined(__cpp_concepts) && __cpp_concepts >= 201500
23#include <concepts>
24#endif
25
26namespace LOG4CXX_NS
27{
28namespace helpers
29{
30
31
35template <class T>
37{
38public:
40 {
41 new(&storage) T();
42 }
43 template <class Arg0, class... Args>
44#if defined(__cpp_concepts) && __cpp_concepts >= 201500
45 requires (!std::same_as<WideLife, Arg0>)
46#endif
47 WideLife(Arg0&& arg0, Args&&... args)
48 {
49 new(&storage) T(std::forward<Arg0>(arg0), std::forward<Args>(args)...);
50 }
51
53 {
54#if LOG4CXX_EVENTS_AT_EXIT
55 // keep the holded value alive
56#else
57 value().~T();
58#endif
59 }
60
61 T& value()
62 {
63 return *reinterpret_cast<T*>(&storage);
64 }
65
66 const T& value() const
67 {
68 return *reinterpret_cast<const T*>(&storage);
69 }
70
71 operator T&()
72 {
73 return value();
74 }
75
76 operator const T&() const
77 {
78 return value();
79 }
80
81private:
82 alignas(T) char storage[sizeof(T)];
83 // Non-copyable
84 WideLife(const WideLife& other) = delete;
85 WideLife(const WideLife&& other) = delete;
86 // Non-assignable
87 WideLife& operator=(const WideLife& other) = delete;
88 WideLife& operator=(const WideLife&& other) = delete;
89}; // class WideLife
90} // namespace helpers
91} // namespace log4cx
92
93#endif //_LOG4CXX_HELPERS_WIDELIFE_H
The WideLife wrapper is destined to prolongate the runtime logger state lifetime from static duration...
Definition: widelife.h:37
WideLife(Arg0 &&arg0, Args &&... args)
Definition: widelife.h:47
WideLife()
Definition: widelife.h:39
const T & value() const
Definition: widelife.h:66
~WideLife()
Definition: widelife.h:52
T & value()
Definition: widelife.h:61
#define LOG4CXX_NS
Definition: log4cxx.h:104